What does this line connect to? And what is it called?

It should route down to the frame where there is a grommet and it just vents down there.

 

Listen man, you seem to be very educated on this subject or have since educated yourself on the subject but regardless, the OP asked a question about the line that has nothing on it and your response was this, "Yeah thats an evap line, should go back and connect to the top of the gas tank where there are a couple sensor things and the fuel sending unit." That response was incorrect. Furthermore, this question pertained not to what that line is rather, where it goes. The answer was correct. It terminates a little further down and does not connect to anything. I did learn something new by reading your newest response but regardless again, OP wanted to know where this line went and your first answer was back to the gas tank, second answer was that it should go back to the intake... I don't know anything about anything but I know that line used to have a rubber line extension off of the hard line and like others have said it's supposed to hang straight down and it does NOT connect to anything else.

Your last answer is very detailed while your first answer includes words like "SENSOR THINGS". Hard to believe you knew that much about the fuel/vapor system when you wrote that sentence. Seems like you went and read about this and maybe copy pasted the working of the system. Congrats! I learned something. But in the end your first answer was absolutely incorrect.

 

Bachelors in Mechanical Engineering, with a minor in Energy Systems Engineering. Took several classes on pollution control systems, power generation, and renewable energy to fulfill the minor. I've troubleshooted several evap and emissions related CELs on my own truck. Both parents work in environmental engineering/policy dealing with air pollution (specifically mobile sources). I currently work in the renewable energy sector. Sorry should've listed my qualifications in the previous post, I'm not just a keyboard warrior trust me and I like learning new things whenever possible. My confusion was initially because I didn't realize OP had a 6 cyl and didn't look too closely at the pictures or post. Evap canister is located in the engine bay in 6cyls vs on top of the fuel tank in the 4cyls vac line routing is therefore a bit different. I'd be happy to put my some of my course work to use and talk about pollution control or mechanical systems.

 

Yeah the piece of tubing is to direct it out of the engine bay. If the purge valve, VSV or other components of the evap system were malfunctioning it could send gas vapors into the engine bay. Then if there's a spark, like when starting the engine...boom

 

1st gens don't have EVAP pumps and do vent to atmosphere just not constantly or when engine is running.

 

Mine goes right into the side of the frame down below.

 

Right, there’s a smaller box shaped object on top of the canister you can see in the OPs pictures that connects to the vent and one of the VSVs or the purge valve I believe. Correct, like you said it shouldn’t be venting to the atmosphere unless it absolutely has to...like it it’s sitting for a long time accumulating gas vapor and needs to purge but the engine isn’t running.

Still skeptical about how it pulls a vacuum to run the test tho, I could’ve sworn there was a small pump...or maybe the first gens use the vacuum from the engine to vacuum the system and perform the test.

 

Do you know where the vacuum relief valve is in the 1st gens EVAP?

 

Let me take a look at my FSM, but I know that the 2.7Ls have two valves/solenoids in the engine bay and one attached to the charcoal canister. I believe the two in the engine bay are called the “Vacuum control valve” and “vapor purge valve”

The one on the canister IIRC is also some type of vacuum control valve, and this is what stopped working on mine due to rust. Sadly they’re not replaceable, or at least I wasn’t able to find a replacement part.

 

@Black DOG Lila looks like the "purge" valve that purges fumes into the intake is located in the engine bay and in the schematic below it is called "VSV for Evap" it should be connected to a little green vacuum test port.

 

The EVAP vacuum relief valve is located in the gas cap.

 

Ah gotcha, didn’t know it was called that. I’ve heard it called a gas tank vent or just check valve, but never that, learn something new every day! It relieves the negative pressure in the tank as the fuel level drops by letting air into the tank, right?

 

No. As fuel level drops the air line prevents vacuum when engine is running. When engine is off the vacuum relief valve in gas cap relieves tank vacuum as fuel cools.

 

Ok...semantics but, when there’s a temperature decrease volume decreases. Same difference. So whether it’s temp or a leak or fuel being used the check valve equalizes the pressure preventing the tank from being squashed by the pressure differential.

 

Look man, I'm not saying I'm a know-it-all when it comes to cars and every single part on them. Same goes for you @j4roe I wasn't trying to be condescending or a know-it-all before, my bad if it came off that way. I'm a young guy and I've only been wrenching for 5 years or so. Any professional mechanic or shade tree mechanic that's been doing this stuff for even a few years without a doubt knows more about wrenching than I do. I respect that, and I love learning from them whenever possible, and I like being challenged by people. What I do truly appreciate and like to chime in on is the engineering and science behind every aspect of these trucks and cars in general. That's what got me interested in working on them in the first place, and that's why I chose to become a mechanical engineer. That's also why I joined this forum, it's a great resource to learn from with tons of people and tons of knowledge. I offered up some of my knowledge of pollution control systems because I spent a great deal of time in college learning about them, grew up hearing my parents talk about them, and I thought it was pertinent. Plus the average Joe probably doesn't understand how they work or what they do. Sure I got some semantics and parts wrong, and I'll own that 100%. But I don't particularly like the condescending messages, and I'm not calling you out specifically, I see it in almost every thread I read. I think mocking someone or being, for lack of a better term, a dick, detracts from people that are trying to learn and get their questions answered. We were all in their shoes at one point and that's important to remember